From 65365caa213dea1674670e7e5e27e69ad04be242 Mon Sep 17 00:00:00 2001
From: Adrien De Coninck <deconinck.adrien@gmail.com>
Date: Tue, 24 Oct 2023 16:32:36 +0200
Subject: [PATCH] d3d11videosink: post "have-window-handle" element message on
 the bus

* when window_id is not user-provided and window_type==GST_D3D11_WINDOW_NATIVE_TYPE_HWND
* allows user to retrieve internally created window handle
  * for custom positionning
  * for custom icons
  * ...

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5544>
---
 .../gst-plugins-bad/sys/d3d11/gstd3d11videosink.cpp       | 8 ++++++++
 .../gst-plugins-bad/sys/d3d11/gstd3d11window_win32.cpp    | 7 +++++++
 .../gst-plugins-bad/sys/d3d11/gstd3d11window_win32.h      | 3 +++
 3 files changed, 18 insertions(+)

diff --git a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11videosink.cpp b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11videosink.cpp
index 57cc2ffd01..490d12adfb 100644
--- a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11videosink.cpp
+++ b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11videosink.cpp
@@ -1019,6 +1019,14 @@ gst_d3d11_video_sink_prepare_window (GstD3D11VideoSink * self)
 #if (!GST_D3D11_WINAPI_ONLY_APP)
     case GST_D3D11_WINDOW_NATIVE_TYPE_HWND:
       self->window = gst_d3d11_window_win32_new (self->device, self->window_id);
+      if (!self->window_id) {
+        HWND internal_hwnd =
+            gst_d3d11_window_win32_get_internal_hwnd (self->window);
+        GST_DEBUG_OBJECT (self, "Have window handle %" G_GUINTPTR_FORMAT,
+            (guintptr) internal_hwnd);
+        gst_video_overlay_got_window_handle (GST_VIDEO_OVERLAY (self),
+            (guintptr) internal_hwnd);
+      }
       break;
 #endif
 #if GST_D3D11_WINAPI_APP
diff --git a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.cpp b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.cpp
index 70f3a9ac00..9b3b18ce79 100644
--- a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.cpp
+++ b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.cpp
@@ -1285,6 +1285,13 @@ gst_d3d11_window_win32_change_fullscreen_mode (GstD3D11Window * window)
   }
 }
 
+HWND
+gst_d3d11_window_win32_get_internal_hwnd (GstD3D11Window * window)
+{
+  GstD3D11WindowWin32 *self = GST_D3D11_WINDOW_WIN32 (window);
+  return self->internal_hwnd;
+}
+
 GstD3D11Window *
 gst_d3d11_window_win32_new (GstD3D11Device * device, guintptr handle)
 {
diff --git a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.h b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.h
index 7bdc050695..21bb640bb8 100644
--- a/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.h
+++ b/subprojects/gst-plugins-bad/sys/d3d11/gstd3d11window_win32.h
@@ -34,6 +34,9 @@ G_DECLARE_FINAL_TYPE (GstD3D11WindowWin32,
 GstD3D11Window * gst_d3d11_window_win32_new (GstD3D11Device * device,
                                              guintptr handle);
 
+HWND gst_d3d11_window_win32_get_internal_hwnd (GstD3D11Window * window);
+
+
 G_END_DECLS
 
 #endif /* __GST_D3D11_WINDOW_WIN32_H__ */